newbie
you need the kit, heater, pressure gauge, purge (optional but pretty much a must have), window switch, and fuel pressure safety switch (again, optional, but safety!)
the nx wet kit was awesome on my car back when it was bolt on, trapped 121 easing off the line since i still had the stock clutch and rear.
for the a4, you will have to tweak your shift points some to get it to shift where its making the most of the power band.

